AN4489 5.2.2 章节介绍FT引脚时，写到However, a GPIO is five-volt tolerant only in input mode. When the output mode is enabled, the GPIO is no more five-volt tolerant. For more details about I/O input voltage, refer to V**IN **parameters in the general operating conditions table of the datasheet

有个疑问，这样配成IIC通讯，和5V设备通讯难道不是配成输出吗，这样不就不能兼容5V了